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    <title>Document</title>
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    <script>
        // 数据代理:通过一个对象代理对另一个对象中属性的操作（读/写)

        let ojb1 = {x:100};
        let ojb2 = {y:200};

        Object.defineProperty(ojb2,'x',{
            get(){
                return ojb1.x;
            },
            set(value){
                obj.x = value;  //obj2.x 会显示100, obj2.x = 300, 再次 obj2.x 会显示300
            },
        })
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